Science (EVS K-5) · Class 1 · Water · Term 3

Water Can Change!

See how water can be a liquid we drink, a solid like ice, or a gas like the steam from a hot cup of tea.

TL;DR:Get ready to explore the amazing, changing nature of water! This topic helps your students see how the simple water they drink can turn into hard ice or an invisible gas called steam.

• CBSE Learning Outcomes
• NCERT EVS Curriculum for Primary Stage: Theme - Water (Properties and Forms of Water)

About This Topic

This topic introduces Class 1 students to the fundamental concept of the states of matter, using water as a familiar and tangible example. Aligned with the NCF's emphasis on learning through observation and exploration, this lesson moves from concrete experiences to abstract ideas. Students will engage with water in its three forms: solid (ice), liquid (water), and gas (steam). The focus is not on complex scientific terminology but on building a strong observational foundation. By seeing, touching, and discussing how water changes with temperature, students begin to understand the dynamic nature of the world around them. This foundational knowledge is crucial for later studies in physical sciences, providing a practical anchor for concepts like melting, freezing, boiling, and condensation.

The pedagogical approach should be hands-on and inquiry-based. Simple, safe classroom demonstrations and activities are key to making the learning stick. For instance, observing an ice cube melt or seeing steam rise from a heated kettle (with safety precautions) makes the transformation process visible and memorable. The lesson should connect directly to the children's daily lives in India, such as seeing ice in a cold drink, water from the tap, and steam from a pressure cooker or a hot cup of chai. This contextualisation helps make the scientific concept relevant and easier to grasp for young learners.

Key Questions

1. Identify what happens when you put water in the freezer.
2. Explain where the steam from a boiling kettle goes.
3. Compare an ice cube to the water in your glass.

Learning Objectives

• Identify the three forms of water: solid (ice), liquid (water), and gas (steam).
• Describe that heating causes ice to melt and water to turn into steam.
• Explain that cooling causes water to freeze into ice.
• Observe and communicate the changes in water's form.
• Compare the physical properties of ice and liquid water.

Key Vocabulary

Solid	A form of matter that has a fixed shape, like an ice cube or a stone.
Liquid	A form of matter that can flow and takes the shape of its container, like water in a glass.
Gas	A form of matter that spreads out to fill any space, like steam from a kettle or the air we breathe.
Melt	To change from a solid to a liquid using heat.
Freeze	To change from a liquid to a solid using cold.

Watch Out for These Misconceptions

Common Misconception

Steam or water vapour just disappears and vanishes forever.

What to Teach Instead

Steam is water that has turned into a gas. It mixes with the air, which we also cannot see. You can show that it's still there by catching it on a cold surface, where it will turn back into tiny drops of liquid water.

Common Misconception

Ice, water, and steam are three completely different things.

What to Teach Instead

They are all the same thing, water, just in different forms. We can prove this by melting an ice cube to get water, and then freezing that same water to get an ice cube back.

Common Misconception

The water droplets on the outside of a cold glass are leaking from the inside.

What to Teach Instead

The droplets come from the air. There is invisible water vapour in the air all around us, and when it touches the cold glass, it cools down and turns back into liquid water.

Active Learning Ideas

Mystery Object

The Great Ice Melt

Give each group an ice cube on a small plate. Have them observe it over time, noting how it changes from a hard solid to a puddle of liquid water. They can draw pictures of the ice cube at the beginning and the puddle at the end.

20 min·Small Groups

Mystery Object

Spot the Steam!

As a teacher-led demonstration, carefully boil water in an electric kettle. Ask students to observe the steam coming out and discuss where it goes. Hold a cool steel plate above the steam to show how water droplets (condensation) form.

15 min·Whole Class

Mystery Object

Water Shape Shifter

Provide students with a small jug of water and various containers of different shapes (e.g., a glass, a bowl, a bottle). Let them pour the water from one container to another to see how the liquid takes the shape of its container, unlike a solid ice cube.

15 min·Pairs

Real-World Connections

• Making kulfi or ice pops at home by freezing sweet milk or juice.
• Seeing steam rise from a hot pressure cooker while mummy cooks dal.
• Watching wet clothes dry on a clothesline in the sun.
• Observing dew drops (condensed water vapour) on leaves and grass on a cool morning.
• Seeing your breath look like a small cloud on a very cold winter day.

Assessment Ideas

Quick Check

Picture Sorting Game: Students sort cards with images (e.g., ice cube, river, cloud, steam from chai, puddle) into three boxes labelled 'Solid', 'Liquid', and 'Gas'.

Quick Check

Show and Tell: Ask students to describe what is happening in a picture, for example, a picture of an ice cream melting in the sun. Listen for their use of vocabulary like 'melt', 'solid', 'liquid'.

Quick Check

Drawing Story: Students draw a three-part cartoon showing an ice cube being left on a table, melting into water, and then the puddle drying up.

Frequently Asked Questions

If steam is water, why can't we drink it?

Steam is a gas and it is very, very hot, so it would burn your mouth. When it cools down and changes back into liquid water, it becomes safe to drink again.

Why does an ice cube feel hard but water is wet and splashy?

When water gets very cold, it freezes and becomes a solid, called ice. Solids have a fixed shape and feel hard. Liquid water does not have its own shape, so it can flow and splash around.

Where does the water in a puddle go when the sun shines on it?

The sun's heat warms the water and slowly turns it into invisible water vapour, which is a gas. This gas then rises and mixes with the air. This process is called evaporation.